US PATENT SUBCLASS 16 / 306
.~.~.~ To counterbalance weight of hinged member (e.g., horizontal closure biased to open position)

Current as of: June, 1999
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16 /   HD   MISCELLANEOUS HARDWARE

221  DF  HINGE {32}
277  DF  .~ Resiliently biased hinge {10}
304  DF  .~.~ Coil {3}
306.~.~.~ To counterbalance weight of hinged member (e.g., horizontal closure biased to open position)

DEFINITION

Classification: 16/306

To counterbalance weight of hinged member (e.g., horizontal closure biased to open position):

(under subclass 304) Hinge wherein the torsion of the elastically deformable helix or flat spiral is arranged to offset the weight of a hinged member* as the member is swung about the hinge axis*.

SEE OR SEARCH THIS CLASS, SUBCLASS:

289+, for a hinge in which the weight of a hinged member* is offset by compression or extension of a helical spring oriented transversely to the hinge axis*.